IDY25404: Sigma (all-lvls) "pop-flds" fields

A number of raw and post-processed NWP products are available as outputs from the Australian Community Climate Earth-System Simulator (ACCESS) suite of Numerical Weather Prediction models which are run routinely by the Bureau of Meteorology's National Meteorological & Oceanographic Centre (NMOC). This document describes the content of the ACCESS-C ADELAIDE (version APS0) IDY25404.pop-flds.all-lvls.YYYYMMDDHH.HHH.sigma series of products.

Model summary

ACCESS-C ADELAIDE covers the Adelaide domain, has a resolution of about 5 km and is run twice per day (00Z and 12Z basetimes) out to a forecast hour of +36. This model is nested in the ACCESS-R model and consists of only a forecast component.

NWP data filename convention

All NWP files in this product series have names that conform to the following convention:

IDY25404.pop-flds.all-lvls.YYYYMMDDHH.HHH.sigma.grb or IDY25404.pop-flds.all-lvls.YYYYMMDDHH.HHH.sigma.nc

NetCDF

NetCDF data is of the "classic format" variant (compatible with the unidata NetCDF library version 3.6.x+)

Please ignore the accum_value metadata value. This parameter is not always set correctly for non-instantaneous fields.

Longitudes in the NetCDF files lie in the range [0.0 degrees, 360.0 degrees]. The NetCDF files somewhat misleadingly describe the valid range attribute for this dimension as -180 to +360.

Appendix B - Extended Field Descriptions

Extended description of single-level fields

Par

NetCDF var

Detailed description

134.128

sfc_pres

Atmospheric pressure at the surface. [Pa]

Extended description of multi-level fields

Par

NetCDF var

Detailed description

017.228

dewpt

Dewpoint temperature. Calculated by (iteratively) finding the
temperature at which the partial pressure due to water vapour equals the
saturated water vapour partial pressure where the saturation partial
pressure of water vapour represents the saturation vapour pressure over
liquid water for temperatures above the triple point, over ice for
temperatures 20 degrees below the triple point, and a linear combination
of the two for temperatures in-between. [K]

156.128

geop_ht

Geopotential height of level (m above the geoid). [m]

132.128

merid_wnd

Meridional (V) component of the wind velocity. [m s-1]

130.128

air_temp

Air temperature. [K]

134.228

vertical_wnd

Vertical (W) component of the wind velocity. [m s-1]

135.128

omega

Vertical component of the wind velocity in pressure co-ordinates (often
referred to as "omega"). [Pa s-1]

131.128

zonal_wnd

Zonal (U) component of the wind velocity. [m s-1]

Please note:

Fields in the above tables are listed in the same order as shown in the Parameters section of this document.

The nature of fields can not always be deduced easily from their NetCDF variable names. It is always safest to refer to the detailed description of a parameter.